This addon slows the ridiculous running speed to a more reasonable one, without being too over realistic

Even most of the well trained athletes are not capable of doing so, especially with a 20kg backpack, heavy gear and boots and a weapon in their hands.

This mod reduces running speed for 100 meters to 15,6 seconds.

Every Bundeswehrsoldat (german foot-soldier) has to be able to do a 100 meter sprint (without gear!) in 13,6 seconds or less.
So I ssume a top class special forces member like Degtyarev could very well be able to do a 100 meter sprint with gear and added weight in 15,6 seconds.